On the radiative heat exchange between spherical particles at small distances

TL;DR

This paper recalculates the radiative heat exchange between spherical particles using fluctuation electrodynamics and corrects the numerical coefficient in the integral expression, providing more accurate theoretical results.

Contribution

It corrects the numerical coefficient in the integral expression for radiative heat exchange between spherical particles within fluctuation electrodynamics.

Findings

Correct numerical coefficient is 4/pi, not as previously reported.

Revised calculations improve the accuracy of heat exchange predictions.

The study clarifies the theoretical framework for small-distance particle interactions.

Abstract

Radiative heat exchange of spherical particles is recalculated in the framework of fluctuation electrodynamics using the dipole approximation. We show that correct numerical coefficient in the resulting integral expression equals 4/pi, in contrast with that obtained by other authors.